Is there an easy and free way for me to host a website specifically for displaying college notes? Some of my peers have created a repository of notes and content and stored them in a shareable Google Drive folder. I, however, wish to share my notes in a format more practical than just a cloud storage directory, similar to those of code library documentation sites.

My requirements are as follows.

1. I want the website to allow categorization of notes into courses and units or deeper if necessary.
2. The notes should support file formats like PDF, images, markdown, HTML or a combination of any of them.
3. I should be able to add and edit the notes from any device at any time.

Is there any pre-made software for this purpose or do I have to create a website and a workflow myself? I am fine with either of them as long as the above requirements are met in a convenient manner.